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smaller bucket (with the smallest being 16 bytes).
，这一点在体育直播中也有详细论述
See CONTRIBUTING.md for development setup and guidelines.
The primary signal is desiredSize on the controller. It can be positive (wants data), zero (at capacity), negative (over capacity), or null (closed). Producers are supposed to check this value and stop enqueueing when it's not positive. But there's nothing enforcing this: controller.enqueue() always succeeds, even when desiredSize is deeply negative.